Oh!
The anal fin is the single one, on the underside of the fish, and just in front of the vent.
The female, when gravid, (pregnant), is fatter than the male, and depending on it's color, the babies can be seen thru the abdomen skin.
In good conditions they have their babies about 4 to 6 weeks apart, and each birthing is a multiple one, having many little ones scooting around the tank being devoured by the other fish, and at times mum and dad, is a bit upsetting, so some thick planting is required for the little ones to find refuge.
But that's a whole other question and answer time.
Alan 104